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Finding the Fourth Proportional to 15,856.25, 21,881.63 and 8,783.13

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Solution

The fourth proportional to 15,856.25, 21,881.63 and 8,783.13 is: 12,120.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.25 : 21,881.63 = 8,783.13 : x
  2. Step 2: Convert to fraction form
    15,856.25/21,881.63 = 8,783.13/x
  3. Step 3: Cross multiply
    15,856.25x = 21,881.63 × 8,783.13
  4. Step 4: Simplify right side
    15,856.25x = 192,189,156.99
  5. Step 5: Solve for x
    x = 192,189,156.99/15,856.25
  6. Step 6: Final answer
    x = 12,120.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.